XML 64 R62.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Fair Value of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Dealer marks of securities | 79.00% | 79.00%
Percentage of carrying value for which dealer quotes have been received | 90.00% | 90.00%
Percentage difference of internal valuation than dealer marks | 2.00% | 2.00%
Commercial Loans |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair value option elected aggregate carrying amount, asset | $ 149 | $ 268
Commercial Secured Borrowings |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair value option elected aggregate carrying amount, asset | 30 | 65
Asset-backed Securities |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Dealer marks of securities | 42.00% | 42.00%
Percentage difference of internal valuation than dealer marks | 1.00% | 1.00%
Senior Securities | Residential |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair value option elected aggregate carrying amount, asset | $ 1,740 | $ 2,820
Mortgage Servicing Rights | Maximum |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Percentage difference of internal valuation than dealer marks | 2.00% | 2.00%

X
- Definition Fair Value, Option, Assets, Aggregate Carrying Amount During Period + References No definition available. + Details
Name: | rwt_FairValueOptionAssetsAggregateCarryingAmountDuringPeriod
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage Difference Of Internal Valuation Than Dealer Marks + References No definition available. + Details
Name: | rwt_PercentageDifferenceOfInternalValuationThanDealerMarks
Namespace Prefix: | rwt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of Carrying Value for Which Dealer Quotes Were Received on Securities + References No definition available. + Details
Name: | rwt_PercentageOfCarryingValueForWhichDealerQuotesWereReceivedOnSecurities
Namespace Prefix: | rwt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of Third-party Dealer Quotes Received on Securities. + References No definition available. + Details
Name: | rwt_PercentageOfDealerQuotesReceivedOnSecurities
Namespace Prefix: | rwt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration